It took some time for me to compile LibiCal for arm64 and x86_64 architecture for iOS(device and simulator). Thought it may be useful for others. Here is the steps I followed to compile LibiCal-1.0. I have taken code from below link

and modified a bit to suit for Xcode 5.1

1) download LibiCal from below URL

http://sourceforge.net/projects/freeassociation/

Untar and get into libCal-1.0 folder. Then run

./bootstrap

(Need to download make tools from http://www.jattcode.com/installing-autoconf-automake-libtool-on-mac-osx-mountain-lion/ )

Use below script

#!/bin/sh

# SEE: http://www.smallsharptools.com/downloads/libical/

PATH="`xcode-select -print-path`/usr/bin:/usr/bin:/bin"

# set the prefix
PREFIX=${HOME}/Library/libical
OUTPUTDIR=../libical-build

export ARCH=arm64

# Select the desired iPhone SDK
export SDKVER="7.1"
export DEVROOT=`xcode-select --print-path`
export  SDKROOT=$DEVROOT/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS${SDKVER}.sdk
export IOSROOT=$DEVROOT/Platforms/iPhoneOS.platform

# Includes
# find $DEVROOT -type d -name include|grep -i iphone|grep -i arm-apple-darwin|grep -vi    install-tools|grep -vi simulator

# $SDKROOT/usr/include
# $DEVROOT/Platforms/iPhoneOS.platform/Developer/usr/llvm-gcc-4.2/lib/gcc/arm-apple-darwin10/4.2.1/include

if [ ! -d $DEVROOT ]
then
        echo "Developer Root not found! - $DEVROOT"
        exit
fi

echo "DEVROOT = $DEVROOT"

if [ ! -d $SDKROOT ]
then
        echo "SDK Root not found! - $SDKROOT"
        exit
fi

echo "SDKROOT = $SDKROOT"

if [ ! -d $IOSROOT ]
then
        echo "iOS Root not found! - $IOSROOT"
        exit
fi

echo "IOSROOT = $IOSROOT"

# finding ld
# find $DEVROOT -type f -name ld|grep -i iphone

# Set up relevant environment variables 
export CPPFLAGS="-arch $ARCH -I$SDKROOT/usr/include -I$IOSROOT/Developer/usr/llvm-gcc-4.2/lib/gcc/arm-apple-darwin10/4.2.1/include"
export CFLAGS="$CPPFLAGS -pipe -no-cpp-precomp -isysroot $SDKROOT"
export CXXFLAGS="$CFLAGS"
export LDFLAGS="-L$SDKROOT/usr/lib/ -arch $ARCH"

export CLANG=$DEVROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang

#export CC=$IOSROOT/Developer/usr/bin/arm-apple-darwin10-llvm-gcc-4.2
#export CXX=$IOSROOT/Developer/usr/bin/arm-apple-darwin10-llvm-g++-4.2

export CC=$CLANG
export CXX=$CLANG
export LD=$IOSROOT/Developer/usr/bin/ld
export AR=$IOSROOT/Developer/usr/bin/ar 
export AS=$IOSROOT/Developer/usr/bin/as 
export LIBTOOL=$IOSROOT/usr/bin/libtool 
export STRIP=$IOSROOT/Developer/usr/bin/strip 
export RANLIB=$IOSROOT/Developer/usr/bin/ranlib

HOST=arm-apple-darwin10

if [ ! -f $CC ]
then
        echo "C Compiler not found! - $CC"
        exit
fi

if [ ! -f $CXX ]
then
        echo "C++ Compiler not found! - $CXX"
        exit
fi

if [ ! -f $LD ]
then
        echo "Linker not found! - $LD"
        exit
fi

if [ -d $OUTPUTDIR/$ARCH ]
then 
       rm -rf $OUTPUTDIR/$ARCH
fi

find . -name \*.a -exec rm {} \;
make clean

./configure --prefix=$PREFIX --disable-dependency-tracking --host $HOST CXX=$CXX CC=$CC LD=$LD AR=$AR AS=$AS LIBTOOL=$LIBTOOL STRIP=$STRIP RANLIB=$RANLIB

make -j4

# copy the files to the arch folder

mkdir -p $OUTPUTDIR
mkdir -p $OUTPUTDIR/$ARCH

cp `find . -name \*.a` $OUTPUTDIR/$ARCH/

xcrun -sdk iphoneos lipo -info $OUTPUTDIR/$ARCH/*.a

echo $ARCH DONE

echo "See $OUTPUTDIR"

modify the line:11 "export ARCH=arm64" to get desired architecture, i.e. arm64, armv7, armv7s.

This should create bins for desired architecture in ../libical-build folder.

Building for x86_64.

Use following commands to run get build for x86_64.

tar -xovf libical-1.0.tar
cd libical-1.0
./bootstrap
./configure
make

This should create libical.a in folder src/libical/.libs/libical.a.

Creating a fat library

Use below command to build the fat library. (Please use appropriate lipo command).

export DEVROT=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/lip

$DEVROOT/usr/bin/lipo 
    -arch arm64 $OUTPUTDIR/armv6/libical.a 
    -arch i386 $OUTPUTDIR/i386/libical_Simulator.a 
    -arch armv7 $OUTPUTDIR/x86_64/libical.a 
    -arch armv7s $OUTPUTDIR/x86_64/libical.a 
    -arch x86_64 $OUTPUTDIR/x86_64/libical.a 
    -create -output $OUTPUTDIR/libical_fat_universal.a

Please set appropriate OUTPUTDIR environment variable.

I hope above will help some one who wants to quickly build Libical for iOS.

I have found a fix for the issue. The main thing I did was add the following switch

-mios-simulator-version-min=7.0

Here is my current version of the script:

 #!/bin/sh

set -o xtrace

# SEE: http://www.smallsharptools.com/downloads/libical/

PATH="`xcode-select -print-path`/usr/bin:/usr/bin:/bin"


if [ ! -n "$ARCH" ]; then
    export ARCH=armv7
fi


# Select the desired iPhone SDK
export SDKVER="7.1"
export DEVROOT=`xcode-select --print-path`

if [ "i386" = $ARCH ] || [ "x86_64" = $ARCH ]; then
    export SDKROOT=$DEVROOT/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator${SDKVER}.sdk
    export MIOS="-mios-simulator-version-min=7.0"
else
    export SDKROOT=$DEVROOT/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS${SDKVER}.sdk
    export MIOS=""
fi;
export IOSROOT=$DEVROOT/Platforms/iPhoneOS.platform



if [ ! -d $DEVROOT ]
then
        echo "Developer Root not found! - $DEVROOT"
        exit 1
fi

echo "DEVROOT = $DEVROOT"

if [ ! -d $SDKROOT ]
then
        echo "SDK Root not found! - $SDKROOT"
        exit 1
fi

echo "SDKROOT = $SDKROOT"

if [ ! -d $IOSROOT ]
then
        echo "iOS Root not found! - $IOSROOT"
        exit 1
fi

echo "IOSROOT = $IOSROOT"

# Set up relevant environment variables 
export CPPFLAGS="-arch $ARCH -I$SDKROOT/usr/include $MIOS --debug"
export CFLAGS="$CPPFLAGS -pipe -no-cpp-precomp -isysroot $SDKROOT "
export CXXFLAGS="$CFLAGS"
export LDFLAGS="-L$SDKROOT/usr/lib/ -arch $ARCH"

export CLANG=$DEVROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang


export CC=$CLANG
export CXX=$CLANG
export LD=$IOSROOT/Developer/usr/bin/ld
export AR=$IOSROOT/Developer/usr/bin/ar 
export AS=$IOSROOT/Developer/usr/bin/as 
export LIBTOOL=$IOSROOT/usr/bin/libtool 
export STRIP=$IOSROOT/Developer/usr/bin/strip 
export RANLIB=$IOSROOT/Developer/usr/bin/ranlib
export LIPO="xcrun -sdk iphoneos lipo"
export HOST=arm-apple-darwin10


if [ ! -f $CC ]
then
        echo "C Compiler not found! - $CC"
        exit
fi

if [ ! -f $CXX ]
then
        echo "C++ Compiler not found! - $CXX"
        exit
fi

if [ ! -f $LD ]
then
        echo "Linker not found! - $LD"
        exit
fi

if [ -d $OUTPUT_DIR/$ARCH ]
then 
       rm -rf $OUTPUT_DIR/$ARCH
fi

find ./src -name \*.a -exec rm {} \;
make clean


./configure --prefix="$OUTPUT_DIR" --disable-dependency-tracking --host $HOST CXX=$CXX CC=$CC LD=$LD AR=$AR AS=$AS LIBTOOL=$LIBTOOL STRIP=$STRIP RANLIB=$RANLIB

make -j4

# copy the files to the arch folder

mkdir -p $OUTPUT_DIR
mkdir -p $OUTPUT_DIR/$ARCH

cp `find . -name \*.a` $OUTPUT_DIR/$ARCH/
cp config.log $OUTPUT_DIR/$ARCH/config.log

$LIPO -info $OUTPUT_DIR/$ARCH/*.a

echo $ARCH DONE

echo "See $OUTPUT_DIR"

I've started building out a Objective C wrapper for this library and you can see the progress at https://github.com/ahalls/XbICalendar I the project could use some eyeballs with suggestions and even some help.

strangetimes

Those looking to compile the latest version of libical using cmake (from github) for iOS, please checkout my answer here:

Compiling libical for armv7 and arm64 with cmake

来源：https://stackoverflow.com/questions/22986302/compiling-libical-for-arm64-and-x86-64-for-ios

标签

ios

arm64

libical

Compiling Libical for arm64 and x86_64 for iOS

Building for x86_64.

Creating a fat library